[FFmpeg-trac] #7640(undetermined:new): first part of cut out video only contains audio
FFmpeg
trac at avcodec.org
Thu Dec 27 17:08:21 EET 2018
#7640: first part of cut out video only contains audio
-------------------------------------+-------------------------------------
Reporter: hanshenrik | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug: when cutting out 10.8 seconds starting at 00:11:32
from the video at https://www.youtube.com/watch?v=PojTP32lE_o , the first
2 seconds of the cut only contains the audio (video resumes 2 seconds in)
- notably, this doesn't happen if omitting "-c:v copy -c:a copy"
How to reproduce:
{{{
youtube-dl 'https://www.youtube.com/watch?v=PojTP32lE_o' -o in.mkv -q
2>/dev/null
ffmpeg -i "in.mkv" -c:v copy -c:a copy -ss 00:11:32 -t 10.8 -y test.mkv
ffmpeg version N-92820-gd702600350 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8.2.1 (GCC) 20181201
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-
amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora
--enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg
--enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-
libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex
--enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-
ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
--enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 25.100 / 56. 25.100
libavcodec 58. 42.104 / 58. 42.104
libavformat 58. 25.100 / 58. 25.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, matroska,webm, from 'in.mkv':
Metadata:
COMPATIBLE_BRANDS: iso6avc1mp41
MAJOR_BRAND : dash
MINOR_VERSION : 0
ENCODER : Lavf58.3.100
Duration: 00:20:31.64, start: -0.007000, bitrate: 430 kb/s
Stream #0:0: Video: h264 (Main), yuv420p(progressive), 640x480 [SAR
1:1 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Metadata:
HANDLER_NAME : ISO Media file produced by Google Inc. Created on:
11/13/2018.
DURATION : 00:20:31.630000000
Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
Metadata:
DURATION : 00:20:31.641000000
Output #0, matroska, to 'test.mkv':
Metadata:
COMPATIBLE_BRANDS: iso6avc1mp41
MAJOR_BRAND : dash
MINOR_VERSION : 0
encoder : Lavf58.25.100
Stream #0:0: Video: h264 (Main) (H264 / 0x34363248),
yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 29.97 fps, 29.97
tbr, 1k tbn, 1k tbc (default)
Metadata:
HANDLER_NAME : ISO Media file produced by Google Inc. Created on:
11/13/2018.
DURATION : 00:20:31.630000000
Stream #0:1(eng): Audio: opus ([255][255][255][255] / 0xFFFFFFFF),
48000 Hz, stereo, fltp (default)
Metadata:
DURATION : 00:20:31.641000000
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 264 fps=0.0 q=-1.0 Lsize= 257kB time=00:00:10.78 bitrate=
195.3kbits/s speed=57.7x
video:92kB audio:159kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 2.594684%
}}}
the resulting "test.mkv" is missing the first 2 seconds of video. (but not
the first 2 seconds of audio)
and per the instructions at https://ffmpeg.org/bugreports.html :
{{{
$ ffmpeg -v 9 -loglevel 99 -i in.mkv
ffmpeg version N-92820-gd702600350 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8.2.1 (GCC) 20181201
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-
amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora
--enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg
--enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-
libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex
--enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-
ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
--enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 25.100 / 56. 25.100
libavcodec 58. 42.104 / 58. 42.104
libavformat 58. 25.100 / 58. 25.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with
argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument '99'.
Reading option '-i' ... matched as input url with argument 'in.mkv'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input url in.mkv.
Successfully parsed a group of options.
Opening an input file: in.mkv.
[NULL @ 00000000004d0e40] Opening 'in.mkv' for reading
[file @ 00000000004d1740] Setting default whitelist 'file,crypto'
Probing matroska,webm score:100 size:2048
[matroska,webm @ 00000000004d0e40] Format matroska,webm probed with
size=2048 and score=100
st:0 removing common factor 1000000 from timebase
st:1 removing common factor 1000000 from timebase
[matroska,webm @ 00000000004d0e40] Before avformat_find_stream_info() pos:
1047 bytes read:32768 seeks:0 nb_streams:2
[h264 @ 00000000004d6e00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 00000000004d6e00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 00000000004d6e00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 00000000004d6e00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 00000000004d6e00] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 00000000004d6e00] Format yuv420p chosen by get_format().
[h264 @ 00000000004d6e00] Reinit context to 640x480, pix_fmt: yuv420p
[h264 @ 00000000004d6e00] no picture
[matroska,webm @ 00000000004d0e40] All info found
[matroska,webm @ 00000000004d0e40] stream 0: start_time: 0.000 duration:
-9223372036854776.000
[matroska,webm @ 00000000004d0e40] stream 1: start_time: -0.007 duration:
-9223372036854776.000
[matroska,webm @ 00000000004d0e40] format: start_time: -0.007 duration:
1231.641 bitrate=430 kb/s
[matroska,webm @ 00000000004d0e40] After avformat_find_stream_info() pos:
15422 bytes read:32768 seeks:0 frames:5
Input #0, matroska,webm, from 'in.mkv':
Metadata:
COMPATIBLE_BRANDS: iso6avc1mp41
MAJOR_BRAND : dash
MINOR_VERSION : 0
ENCODER : Lavf58.3.100
Duration: 00:20:31.64, start: -0.007000, bitrate: 430 kb/s
Stream #0:0, 3, 1/1000: Video: h264 (Main), 1 reference frame,
yuv420p(progressive, left), 640x480 [SAR 1:1 DAR 4:3], 0/1, 29.97 fps,
29.97 tbr, 1k tbn, 59.94 tbc (default)
Metadata:
HANDLER_NAME : ISO Media file produced by Google Inc. Created on:
11/13/2018.
DURATION : 00:20:31.630000000
Stream #0:1(eng), 2, 1/1000: Audio: opus, 48000 Hz, stereo, fltp,
delay 312 (default)
Metadata:
DURATION : 00:20:31.641000000
Successfully opened the file.
At least one output file must be specified
[AVIOContext @ 00000000004daa00] Statistics: 32768 bytes read, 0 seeks
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7640>
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